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      cucumber 
      250 ml/8 fl oz/1 cup plain yoghurt 
      1 spring onion (scallion), finely chopped 
      
      15 ml/1 tbsp lime juice 
      15 ml/1 tbsp chopped dill (dill weed) 
      
      15 ml/1 tbsp chopped mint 
      Salt and freshly ground black pepper 
      
      4 pitta breads 
      225 g/8 oz/2 cups cooked lamb, thinly sliced 
      2 tomatoes, thinly sliced 
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